I have wondered if he really wanted to play football, why he didn't go to Canada. Shine there and maybe he would get a look here.

Concussions come from head to head contact, when both players try to 'head' a ball, instead they bang noggins. Also, with falling to the turf. Not rare, gollies colliding with the goal post.
ACL's are also prevalent in girls soccer.

Years ago several of us ran Grandma's marathon in Duluth Minnesota. The winner was from Africa with about 2:14 for a time. He was in the lobby of our hotel the next morning. Graciously signed our T-shirts. He asked us our times and his eyes got big when he exclaimed, "Wow, I don't think I could run for four hours." I would have laughed more but I was hardly moving.